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Replaced another memory mapping app with this one because it's so clear and easy to use. Clear, fast, intuitive UI; fairly smooth pinch-zooming; shows system files as their own drive; can add external storage (although it takes a little poking around to figure that out, and why it's not shown automatically — i.e., that's a"pro" feature, but pro is only 99¢, and the free version has no ads). If it had a list view option (with bars showing directory sizes) and a get-info view for files (showing modification dates, etc.), it would a 5-star app. But those are quibbles. I tried a few similar apps before settling on this one, it's the best of breed.

Only shows 4gb of files in System Storage. This app reminds me of Space Sniffer for PC, but I wish it worked as advertised. I said yes to the only permission it asked, so I'm not sure why it wouldn't show the rest of my phone's memory. Unfortunately a waste of time, I sincerely hope the devs can address this.

It is perfect app for storage size check and it gives exact path of folders, it also show folder name which occupied maximum storage. Thanks to app developer. It is really small app which gives maximum output.